JPS628706Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an overflow prevention valve.

Conventionally, as this type of overflow prevention valve, for example, the first
The one shown in the figure is known. This accommodates a ball valve 3 inside a cylindrical main body 1 with both ends open,
The ball valve 3 is connected via a tension spring 4 to a pin 5 penetrating near one open end on the upstream side of the main body 1, and the ball valve 3 is fitted into the other open end of the main body 1. A seat opening 2 is provided, and this overflow prevention valve is used by being inserted into the tip of a hose end 6 protruding from a gas tank, as shown in the figure.

In a normal state, a gas flow flowing in from the upstream side passes through the gap between the inner periphery of the main body 1 and the ball valve 3 and flows out to the downstream side, as shown by the arrow in the figure.

If an excessive gas outflow occurs on the downstream side due to a gas rubber tube coming off or the like, the gas flow passing through the main body 1 increases. This gas flow pushes the ball valve 3 downstream against the tension spring 4, and the ball valve 3 finally fits into the valve seat opening 2 to block the gas flow path.

However, when the gas flow path is shut off, the ball valve 3, which was once fitted into the valve seat opening 2, escapes from the valve seat opening 2 due to the action of pressure waves generated on the upstream and downstream sides from the flow passage blocking surface, and then again. A so-called chattering phenomenon occurs in which the valve fits into the valve seat port 2 and this process is repeated.

The pressure waves that cause this chattering phenomenon are generated because the ball valve 3 fits into the valve seat opening 2 at high speed.

In the present invention, a valve seat opening 2 is provided at the open end that is the downstream end of a cylindrical main body 1, a ball valve 3 is housed on the upstream side of the valve seat port 2, and a ball valve 3 is housed between the ball valve and the upstream end of the main body 1. In the overflow prevention valve in which a tension spring 4 is inserted and the ball valve 3 is urged in the upstream direction by the tension spring 4, in order to alleviate the above-mentioned chattering phenomenon, the ball valve 3 is The technical problem is to reduce the insertion speed when fitting into the seat opening 2.

The technical means of the present invention taken to solve the above technical problem is to fit a coil spring 7 into the inner wall of the main body 1 on the upstream side following the valve seat opening 2, and to make the inner diameter of the coil spring 7 into a ball. The diameter of the ball valve 3 is set slightly larger than that of the valve 3, and a connecting protrusion 31 is provided protrudingly on the upstream side of the ball valve 3, and the end of the tension spring 4 on the ball valve side is connected to the protrusion 31. 3 is inserted into the valve seat opening 2, the ball valve 3 is inserted from the downstream end of the coil part of the tension spring 4 so that the coil part of the tension spring 4 is located upstream from the upstream end of the coil spring 7. This means that the distance to

The above technical means of the present invention operates as follows.

In the normal state, the ball valve 3 is biased by the tension spring 4, so the ball valve 3
located far upstream of the

Next, when an overflow condition occurs, the ball valve 3 is pushed downstream against the biasing force of the tension spring 4 due to the gas flow at this time. At this time, coil spring 7
The ball valve 3 that has reached the part moves while repeatedly colliding with the wires of the coil spring 7, and due to these collisions, the moving speed of the ball valve 3 is reduced, and in this decelerated state, the ball valve 3 eventually moves. The ball valve 3 is fitted into the valve seat opening 2.

From the downstream end of the coil part of the tension spring 4 to the ball valve 3
Since the distance to is set in advance to a predetermined value, the coil portion of the tension spring 4 is located upstream of the coil spring 7 when the ball valve 3 is fitted into the valve seat opening 2, as described above. Therefore, this coil portion does not enter into the coil spring 7.

Since the present invention has the above configuration, it has the following unique effects.

Since the moving speed of the ball valve 3 is reduced in the latter half of the movement process until the ball valve 3 fits into the valve seat opening 2, the chattering phenomenon is less likely to occur.

Further, since the downstream end of the coil portion of the tension spring 4 does not enter into the coil spring 7, there is no fear that the coil portion of the tension spring 4 will become entangled with the coil spring 7. That is, such entanglement caused by vibration of the ball valve 3 during transportation, which would cause malfunction, will not occur.

Next, embodiments of the present invention described above will be explained based on the drawings.

FIG. 2 shows the overflow prevention valve according to the embodiment of the present invention loaded into the hose end 6. The main body 1 is a cylinder with both ends open, and the valve seat opening 2 is provided at one open end on the downstream side. A coil spring 7 is fitted on the upstream side of the valve seat opening 2. Also, inside the main body 1 is a ball valve 3 having a smaller diameter than the inner diameter of the coil spring 7.
is housed therein, and a connecting protrusion 31 projects from the rear end of the ball valve 3. A pin 5 is provided through the upstream opening end of the other main body 1.
The ball valve 3 is engaged with one hook 41 of the tension spring 4, and the other hook 42 is made to protrude largely forward.
It is engaged with the protrusion 31 of. The ball valve 3 is therefore connected to the pin 5 via a tension spring 4, which limits its freedom of movement.

In the state shown in FIG. 2, when an overflow state occurs in the gas flow flowing in from the direction of the upstream arrow, the ball valve 3 is pushed downstream against the restoring force of the tension spring 4, and each winding of the coil spring 7 It collides with the portions 71, 71 and fits into the valve seat opening 2 while being braked, thereby blocking the gas flow path. (FIG. 3) Therefore, the ball valve 3 is fitted into the valve seat opening 2 after being braked by the respective winding portions 71, 71, so that the fitting speed becomes low.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional example, Fig. 2 is a sectional view showing the usage state of the embodiment of the present invention, and Fig. 3 is a sectional view in an overflow state. ...Valve seat opening, 3...Ball valve, 4...
...Tension spring, 31...Protrusion.

Claims (1)

[Scope of utility model registration request] A valve seat opening 2 is provided at the open end that is the downstream end of the cylindrical main body 1, and a ball valve 3 is housed on the upstream side thereof, and a tension spring 4 is interposed between the ball valve and the upstream end of the main body 1. equipped,
In the overflow prevention valve in which the ball valve 3 is biased in the upstream direction by the tension spring 4, a coil spring 7 is fitted to the inner wall of the main body 1 on the upstream side following the valve seat opening 2, and this The inner diameter of the coil spring 7 is set slightly larger than the diameter of the ball valve 3.
A connecting protrusion 31 is provided protrudingly provided on the upstream side of the tension spring 4 , and the ball valve side end of the tension spring 4 is connected to the protrusion 31 . When the ball valve 3 is fitted into the valve seat opening 2 , the tension spring 4 The tension spring 4 is arranged such that the coil portion of the tension spring 4
A gas overflow prevention valve in which the distance from the downstream end of the coil part to the ball valve 3 is set to a predetermined value.